CONTROLLING METHOD OF CARBURIZING ATMOSPHERE
PURPOSE:To make the quick change in a carburizing atmosphere continuous with precision control by changing over the quick introduction of gas in a manual mode and the automatic fine control of gaseous compsn. in an automatic mode in accordance with the target value for the concn. of CO2. CONSTITUTIO...
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| creator | GOTOU ATSUSHI HORI TOSHIMI |
| description | PURPOSE:To make the quick change in a carburizing atmosphere continuous with precision control by changing over the quick introduction of gas in a manual mode and the automatic fine control of gaseous compsn. in an automatic mode in accordance with the target value for the concn. of CO2. CONSTITUTION:Conversion furnace gases RX, AIR and enriching gas C3H8 are supplied to a carburization furnace, and the supply rates of the latter two are controlled according to the measured value of an IR-CO2 meter. Shot purging of C3H8 is performed in a manual mode for the beginning of a carburization period to decrease the concn. of CO2 toward the 1st target value TV. When the concn. of CO2 attains the target value TV, the mode is changed over to an automatic mode and the automatic control of the gaseous compsn. is started. A deviation alarm is made effective when the concn. of CO2 attains a certain value approximate to a set value SV. When the time set with a timer passes by and a diffusion period begins upon ending of the carburization period, the SV is changed and the mode is again changed over to the manual mode. |
| format | Patent |
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CONSTITUTION:Conversion furnace gases RX, AIR and enriching gas C3H8 are supplied to a carburization furnace, and the supply rates of the latter two are controlled according to the measured value of an IR-CO2 meter. Shot purging of C3H8 is performed in a manual mode for the beginning of a carburization period to decrease the concn. of CO2 toward the 1st target value TV. When the concn. of CO2 attains the target value TV, the mode is changed over to an automatic mode and the automatic control of the gaseous compsn. is started. A deviation alarm is made effective when the concn. of CO2 attains a certain value approximate to a set value SV. 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CONSTITUTION:Conversion furnace gases RX, AIR and enriching gas C3H8 are supplied to a carburization furnace, and the supply rates of the latter two are controlled according to the measured value of an IR-CO2 meter. Shot purging of C3H8 is performed in a manual mode for the beginning of a carburization period to decrease the concn. of CO2 toward the 1st target value TV. When the concn. of CO2 attains the target value TV, the mode is changed over to an automatic mode and the automatic control of the gaseous compsn. is started. A deviation alarm is made effective when the concn. of CO2 attains a certain value approximate to a set value SV. When the time set with a timer passes by and a diffusion period begins upon ending of the carburization period, the SV is changed and the mode is again changed over to the manual mode.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION |
| title | CONTROLLING METHOD OF CARBURIZING ATMOSPHERE |
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